Antirecoil device



5. E. ALLEN ANTIRECOIL DEVICE Original Filed Dec. 30, 1936' PatentedOct. 15, 1940 UNITED STATES PATENT 1 OFFICE Two Fire Equipment Company,Newark,- N. J., a corporation of Delaware I Original applicationDecember 30, 1936, Serial No. 118,207. Divided and this application July13,

v 1938, Serial No. 218,909

(01. 169-11) i charge of the fluid when the horn is disconnected 3Claims.

The present invention relates to fire extinguishers employing a highpressure extinguishing fluid and more especially to antirecoil means,disclosed in my co-pending application Ser. No.

5 118,207, filed December 30, 1936 of which this application is adivision- 7 My invention relates particularly to portable extinguishers,although it is not limited thereto; It is common practice to providecylinders con-. taining high pressure extinguishing fluid, such,forexample, as liquid carbon dioxide, in sizes which may be convenientlycarried by hand to the scene of the fire, the cylinders being providedwith discharge pipes that are adjustable to direct the extinguishingmedium where desired. It is also common practice to provide thedischarge pipe with a discharge horn adapted to prevent entrainment ofair in, the discharging fluid and also, in the-caseof carbon dioxide, totransform the fluid into snow or solidified particles of carbon dioxide.

Owing to the high pressure of liquefied carbon, dioxide the discharge ofthe fluid develops a recoil powerful enough to throw the cylinderviolently about and do considerable damage, unless the cylinder issecurely held. For this reason, it is requisite that the dischargepipebe pro- -vided with suitable antirecoil means, such, for instance, as anozzle forming a plurality of jets 30 which are so disposed that theywill react against one another. t

It will be understood that the strength of the recoil dependsupon thearea of the discharge orifice. The horn is provided with alrelativelysmall orifice through which the highly compressed fluid enters the hornwhere it expands enormously. The recoil is relatively small as long asthe horn is attached because of the minute size of the orifice. Hence,an operator may 10 readily control the horn and direct the discharge atwill. In order to prevent material expansion of the fluid in the spacebetween the end of the discharge pipe and the horn orifice,whichvexpansion might result in suflicient chilling to freeze up theorifice, it is desirable to providerelatively large ports at the end ofthe pipe permitting the .fiuid to reach the horn orifice in acomparatively warm state. With ports of this size an anti- .recoilbalanceis necessary when the horn is detached.

It is an object of my invention to provide means at the discharge end ofthe pipe for connecting a discharge horn thereto and, further, to pro-.vide the discharge end of the pipe with antirecoil means which will givea balanced dis- .being choked up with solidified carbon dioxide.

from the pipe. c

A further object of my invention is to provide a very simple antirecoildevice of this character" which will not project diametrically from the5 pipe and hence will not interfere with the coupling ofa horn over thedevice upon the end of the discharge pipe.

Other objects of my invention will appear in the following descriptionof a preferred embodiment and thereafter the novelty and scope of theinvention will be pointed out in the claims.

In the accompanying drawing:

Figure 1 is a 'diametral longitudinal section through a discharge pipemy invention;

Fig. 2 is a view in section on line 2,-'-2 of Fig. 1,

showing details of my improved anti-recoil device; and j Fig. 3 is aperspective view-of my improted antirecoil device. y

In -Fig. 1, I show the end of a discharge pipe 4 which as disclosed inthe application referred to may be swivelly connected to a portablecontainer" so that it will normally lie substantially parallel thereto.The free end of the pipe 4 is externally thmaded to receive the head 5of a horn 6. This head 5 is formed with a chamber I having an orifice 8in the outer end .1 wall thereof, through which fluid may discharge intothe horn 6. An antirecoil device is provided at the outer end of thepipe- 4 which consists of a plug 10 threaded into the pipe and providedwith a head II. This plug is flattened at opposite sides, as indicatedat l2, providing passages I3 through which the fluid may escape.Howeven'the head H causes .the fluid escaping from the passages I3 to bedi verted laterally in opposite directions,v thereby balancing therecoil of the discharge on one side against that on the other. It willbe understood 9 that the flattening of the body of the plug is carriedpart way into the head as well leaving an overlying lip spaced from theend of the pipe 4 the orifice 8 with insufficient expansion to causeexcessive chilling, thereby keeping the head 5 relatively warm andpreventing the orifice from Since there. will be some expansion of thefluid in and nozzle embodying its passage through the pipe 4 and to theorifice 8, I prefer to provide the pipe 4 with a. covering Id of heatinsulationmaterial.

I have described my invention as applicable to the discharge of carbondioxide, but it will be understood that the antirecoil device may alsobe employed with other fluids and discharge ports or conduits in otherconnections and relations, such as disclosed in Letters Patent of theUnited States No. 2,078,553 granted April 27, 1937 and No. 2,059,189granted October 9, 1934. Hence I wish it to be understood that myinvention is not limited to the particular application shown and that Ireserve the right to make various changes without departing from thespirit and scope of my invention as set forth in the claims.

Iclaim:

l. The combination with a discharge conduit for fluid under pressure, ofa screw plug threaded into said conduit and flattened lengthwise atdiametrically opposite sides thereof to form a pair of dischargepassages between the wall of said conduit and said plug, said plug beingformed with ahead having stops to limit the extent to which the plug maybe screwed into said conduit and said head being partly cut awayoutwardly of said stops to form a lip opposite each passage. adapted tocause lateral deflection of the fluid discharging from the passages.

2. An antirecoll device for a discharge conduit consisting of a plugadapted to be screwed into said conduit, said plug having a threadedbody and an enlarged head-defining laterally extendvide a plurality ofdischarge passages for fluid.

between the wall of the said conduit and said plug, and lips on saidplug disposed opposite said passages respectively and spaced from theend of said conduit and located within the projected circumference ofthe exteriorly threaded portion of said conduitv and a fluid dischargecontinuing head and horn member connected by said exterior threads tosaid discharge conduit while said plug is in position in said conduit.

SCO'I'I E. ALLEN.

